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https://issues.apache.org/jira/browse/HDFS-161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13264522#comment-13264522
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Harsh J commented on HDFS-161:
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[~nemon] - There are better ways to managing configurations on a per-instance
level than doing those things. There are several configuration management tools
out there you can consume.
I'd personally consider that a bad practice cause when it comes to a time where
you're (or someone else is) going to look at the dfs.datanode.data.dir list to
debug an issue on the cluster, it would only mislead with some false values
until you realize.
FWIW in here, I think the doc ought to be fixed instead. There's numerous times
this 'feature' has come handy in my experience.
> DataNode will create missing dfs.data.dir directories contrary to docs
> ----------------------------------------------------------------------
>
> Key: HDFS-161
> URL: https://issues.apache.org/jira/browse/HDFS-161
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: data-node, documentation
> Reporter: Todd Lipcon
> Priority: Minor
> Labels: newbie
>
> The documentation (and HADOOP-340) seems to indicate that if a data dir
> listed in dfs.data.dir does not exist, it will be ignored. In fact, if the
> hadoop user has access to (essentially) mkdir -p the data dir it will do so.
> I'd like to add another configuration parameter, perhaps dfs.data.dir.create
> with default true (to not break any existing tutorials). If this is set to
> false then data dirs that do not exist will not implicitly be created.
> The motivation for this is the same as HADOOP-340 - we have different disk
> configs in our cluster and hadoop is creating data dirs where we do not want
> them.
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